# Astor Special Lecture: Dr. Dmitri D. Ryutov

14 February 2017

**Physics Colloquia Series – Astor Lecture**

Plasma physics helps in establishing an upper bound for the photon mass

Dr. Dmitri D. Ryutov

Lawrence Livermore National Laboratory

Tuesday, 7 March 2017 at 14.00

The finiteness of the photon mass does not contradict the relativity theory: it just puts the photon on par with other particles, with the limiting propagation velocity still in place. The photon mass, even if finite, is incredibly small, less than 10-24 of the electron mass [1], but even at this value it would have a strong effect on large-scale astrophysical phenomena. Effects of a finite photon mass in electrodynamics can be systematically accounted for by the Proca Lagrangian [2] [3] [4]. This talk will summarize earlier approaches to the evaluating the photon mass and then describe the techniques [5] that have led to the current estimate. These techniques are based on the analysis of the Solar wind dynamics at large distances from the Sun [Ref. 6]. A possibility to lower the upper bound by studying magnetohydrodynamics of more distant objects will be discussed.

Lindemann Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford OX1 3PU

Followed by tea/coffee in the Clarendon Laboratory Common room

Details of upcoming colloquia can be found here

For further information please contact Niámh Coll

1.Particle Data Group bi-annual compendium (2016);2. L.D. Landau, E.M. Lifshitz. Quantum Theory of Fields, Oxford: Pergamon (1987); 3. J.D. Jackson. Classical Electrodynamics, Wiley: Chichester (1975); 4.A.S. Goldhaber, M.M. Nieto. Rev. Mod. Phys., 82, 940 (2010); 5. D.D. Ryutov. Plasma Phys. Contr. Fus., 39, 73 (1997); 49, 429 (2007); Phys. Rev. Lett. 103, 20183 (2009); 6. N.F. Ness, L.F. Burlaga. J.Geophys.Res.106, 15803 (2001)

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